I have a ps510 dolmar chainsaw that has a problem bogging down when cutting it has new motor an carb. All that I know is the number that I have. Saw belongs to my son.
Two things. First, is the chain dull? Second, if it develops a "throaty" sounds when you're cutting instead of the "crisp" sound you normally get from a chainsaw or weedwhacker or dirtbike... then the carburetor's running rich - it's "four-stroking". Try fiddling with the two mixture adjustment screws; one should be for idle mixture, the other for high-speed mixture. Get the saw idling and turn one of those screws clockwise ONE-QUARTER TURN. If the saw's idle doesn't change, turn that screw one more quarter-turn. if the saw's idle still doesn't change, thats the high-speed mixture screw.
If the saw's idle changes while you're doing that, then you're on the idle-mixture screw - return it to exactly where it was and adjust the OTHER screw clockwise a quarter-turn. Now try cutting - see if you've improved the saw's performance. If it's still four-stroking, try another quarter-turn.
If you go too far, the saw won't want to run at all at higher speeds... so you'd need to back up the screw the other way. Run it at the richest (most counterclockwise) position where it doesn't four-stroke under load.
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